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Quantum thermodynamics with a single superconducting vortex.

Marek Foltyn1, Konrad Norowski1, Alexander Savin2

  • 1Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, Warsaw PL 02668, Poland.

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Researchers achieved precise control over single superconducting vortices using a novel nanostructure, the Single Vortex Box. This breakthrough enables on-demand vortex manipulation for potential nanoscale memory and quantum computing applications.

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Area of Science:

  • Condensed Matter Physics
  • Nanotechnology
  • Quantum Computing

Background:

  • Superconducting vortices play a critical role in the operation of superconducting nanowire single-photon detectors.
  • Understanding vortex dynamics is essential for advancing superconducting device technology.

Purpose of the Study:

  • To demonstrate complete control over the dynamics of a single superconducting vortex in a nanostructure.
  • To investigate the thermodynamics of single-vortex expulsion and its implications for superconducting devices.

Main Methods:

  • Fabrication of a nanostructure, termed the Single Vortex Box, for vortex confinement.
  • Utilizing field-cooling in an aluminum nanosquare to trap a single vortex.
  • Employing nanosecond electrical current pulses for on-demand vortex expulsion.
  • Applying time-resolving nanothermometry to measure dissipated heat during vortex expulsion.

Main Results:

  • Achieved reliable trapping and on-demand expulsion of a single superconducting vortex.
  • Quantified the dissipated heat during vortex expulsion to be approximately [Formula: see text] joules.
  • Provided insights into the thermodynamic processes relevant to superconducting nanowire single-photon detectors.

Conclusions:

  • The Single Vortex Box offers a proof of concept for a nanoscale nonvolatile memory cell.
  • Demonstrated subnanosecond write and read operations, compatible with quantum processors.
  • Highlights the potential for manipulating superconducting vortices in confined geometries for advanced computing.